[Resolved] Error: WPML enabled but not activated

Problem:
The client is experiencing an issue with WPML's Advanced Translation Editor not being activated due to an API authentication error related to an inactive access key. The client did not receive any email to confirm the access key and there have been no recent changes to the website.
Solution:
We recommend the following steps to resolve the issue:
1. Disable all other plugins to ensure they are not interfering with WPML's functionality.
2. Navigate to WPML → Translation Management to check for any prompts.
3. Unregister and re-register your site's key:
- Go to Plugins → Add New, click the Commercial tab, and select Unregister WPML from this site.
- After the page loads, click on Register WPML. Follow the prompts to get a new key for your site from your WPML account, setting it as a Production site.
- Copy the new key and paste it in the Commercial tab. Delete the old site key in your WPML account.
4. If the error persists, please provide a screenshot of the WPML → Support → Advanced Translation Editor Error page.
5. If WPML was deactivated/reactivated, rest assured that translations and settings are preserved in the database, but ensure to back up your site beforehand.
Additionally, if a translation job seems stuck, make a minor edit to the original page and save it to update the translation status, then reattempt the translation in the WPML Translation Editor.

If these steps do not resolve your issue, or if the solution seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Please feel free to open a new support ticket for further assistance at WPML support forum.